Schedule: the flights that flew on Sunday, Nov 8, re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 1577
SCHEDULED · TYPICAL SCHEDULE
Sunday, November 15
WN 1577 · LAS → ONT
departs 5:26 PM PT · arrives 6:38 PM PT
Forecast issued Fri 4:00 PM ET · 52h before departure
Watch this flight
Other days
Today 77%
Sun 11/15
Mon 11/16 37%
Thu 11/19 49%
Odds over time
Arrive at ONT more than 15 minutes late?
37%
chance · ±4 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
37%
Leave 15+ late
49%
Arrive 1h+ late
9%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
6.9d
Now
1d
12h
6h
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 35% · changed – in 24h
–
37%
Yes 37%
No 63%
Leave LAS more than 15 minutes late?
Calm-weather odds: 48% · changed – in 24h
–
49%
Yes 49%
No 51%
Arrive at ONT more than an hour late?
Calm-weather odds: 9% · changed – in 24h
–
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to ONT?
On time or early
62%
15–30 min late
11%
30 min–1 hour late
17%
1–2 hours late
7%
Over 2 hours late
2%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
WN's recent on-time record
↑
5pm departures from LAS are often late
↑
Later flights pick up delays from earlier in the day
↓
Mostly benign weather forecast at LAS
↓
Sundays in November are usually quieter than average
Weather at each end
LAS (origin)
Gusts 9 kt Ceiling none (clear) Visibility 10+ mi Precip none
ONT (destination)
Gusts 11 kt Ceiling none (clear) Visibility 8 mi Precip none
How this resolves
Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.
Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.